Specification: Fine workmanship, elegant appearance It can effectively suppress the vibration Wolf tone, make the sound more perfect, Special designed for Cello This mute can help suppress the nasty wolf tone , elaborate workmanship Suppressor This is a good quality classic violoncello Wolf Eliminator for players, Equipped with a metal knob, allows you to adjust as you need Install Hole Diameter: 1.5mm / 0.06inch size: 23 x 9 x 17mm Material: stainless steel + rubber colour: silver Package Contents: 1 x violoncello Wolf Eliminator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.